Orthomanus koreanus, Kim & Hendrycks & Lee, 2012
|
publication ID |
https://doi.org/ 10.1080/00222933.2012.713526 |
|
persistent identifier |
https://treatment.plazi.org/id/1E4687AC-FF93-FFAE-FDC0-FB1EFD3C763C |
|
treatment provided by |
Carolina |
|
scientific name |
Orthomanus koreanus |
| status |
sp. nov. |
Orthomanus koreanus View in CoL sp. nov.
(Korean name: Han-guk-but-eun-nun-yeop-sae-u, new)
( Figures 2–5 View Figure 2 View Figure 3 View Figure 4 View Figure 5 )
Type material
Holotype. Adult female. Body 7.1 mm (appendages on one slide), NIBRIV0000246428, Gajin, Goseong-gun, Korea (38 ◦ 22 ′ 02 ′′ N, 128 ◦ 30 ′ 45 ′′ E), 20 October 2005, light trap on bottom, depth 5 m, collected by Y.-H. Kim.
Paratypes. Adult male, 5.4 mm (appendages on one slide), NIBRIV0000246429 , other data same as holotype ; 20 adult males and one female, 6.1–7.1 mm, CMNC 2012-0013 , other data same as holotype ; 104 males, 4.8–7.3 mm, DKU 201205 , other data same as holotype .
Additional material examined. Three males, Haban, Oenalodo Island, Korea (34 ◦ 26 ′ 39 ′′ N, 127 ◦ 32 ′ 06 ′′ E), 30 July 2001, light trap, depth 7 m ; six males, Hosan , Samcheok-si, Korea (37 ◦ 10 ′ 32 ′′ N, 129 ◦ 20 ′ 37 ′′ E), 22 August 2001, light trap, depth 12 m; 13 males , Jukbyeon , Uljin-gun, Korea (37 ◦ 03 ′ 18 ′′ N, 129 ◦ 25 ′ 26 ′′ E), 9 July 2002, light trap, depth 10 m ; six males, Seokbyeong-ri , Pohang-si, Korea (36 ◦ 01 ′ 33 ′′ N, 129 ◦ 34 ′ 41 ′′ E), 26 August 2005, light trap, depth 4 m; 52 males , two females, Buheung-ri , Yeongdeok-gun, Korea (36 ◦ 17 ′ 34 ′′ N, 129 ◦ 22 ′ 42 ′′ E), 20 June 2008, light trap, depth 6 m. All material collected by Y.-H. Kim.
Etymology
The new species is named for its occurrence in Korea.
Description
Female holotype. Body ( Figure 2A View Figure 2 ) 7.1 mm long. Head slightly shorter than pereonites 1–3 combined. Rostrum ( Figure 2B View Figure 2 ) short, moderately deflexed, rounded distally, not reaching end of peduncular article 1 of antenna 1; lateral cephalic lobe rounded; ommatidia scattered, outline of eye obscure.
Antenna 1 ( Figure 2C View Figure 2 ) length ratio of peduncular articles 1–3 = 1.00: 0.85: 0.81, peduncular article 1 stout, peduncular articles 2 and 3 each with long and short setae; flagellum 12-articulate, subequal in length to peduncle.
Antenna 2 ( Figure 2D View Figure 2 ) subequal in length to antenna 1; peduncular articles 1 and 2 short; peduncular article 3 rectangular, 0.72 times article 4, with setae distally; peduncular articles 4 and 5 each with several groups of long setae; flagellum 13-articulate, 0.80 times peduncle, flagellum article 1 long 2.35 times second article.
Upper lip ( Figure 2E View Figure 2 ) ventral margin flat, densely pubescent.
Lower lip ( Figure 2F View Figure 2 ) inner lobes coalesced basally, notched apically, with pubescence; outer lobes pubescent, with two pairs of unequal gland cones on medial margin.
Left mandible ( Figure 2G View Figure 2 ) incisor with three teeth, middle mostly straight; lacinia mobilis five-dentate; accessory spine row with four spines; molar small, non-trituritive, with two spines apically, positioned very close to end of spine row; palp triarticulate, proximal article short, subequal to distal article, article 2 with two rows of 17–18 D2 setae, distal article short, 0.42 times article 2, with 10 or 11 D3 and E3 setae, lateral margin with one seta in the middle.
Right mandible ( Figure 2H View Figure 2 ) similar to left except lacinia mobilis absent and accessory spine row with five spines.
Maxilla 1 ( Figure 2I View Figure 2 ) inner plate with one subapical seta and pubescence; outer plate with seven spine-teeth, variously dentate, the first one massively enlarged; palp biarticulate, proximal article short, distal article 3.03 times proximal one, with apical and apicolateral setae.
Maxilla 2 ( Figure 2J View Figure 2 ) plates short, inner plate slightly shorter than outer one, medial and apical margins setose; outer plate with three setae laterally.
Maxilliped ( Figure 2K View Figure 2 ) inner plate small, with three unequal apical setae; outer plate slender, short, extended to 0.4 times palp article 2, medial and apical margins with nine strong spines; palp robust, four-articulate, medial margin of article 2 and distal half of article 3 with short and long simple setae, article 4 falcate, 0.71 times article 3.
Gnathopod 1 ( Figure 3A View Figure 3 ) coxa triangular, anteroventral margin rounded with simple slender setae; basis elongate, 1.37 times propodus, with four short midanterior and three long anterodistal setae; anterior margin of carpus very short, cryptic, concealed by the abutment of propodus, carpal lobe pointed, extending well beyond posterior end of propodus and appressed to ventral margin of propodus; palm of propodus transverse, slightly convex, with simple setules and short blunt setae, delimited by one spine distally; dactylus falcate, slightly exceeding posterior end of palm.
Gnathopod 2 ( Figure 3B View Figure 3 ) similar to gnathopod 1, but coxa elongate and narrowed distally; basis rectangular, 1.31 times propodus; propodus more elongated than propodus of gnathopod 1.
Pereopod 3 ( Figure 3C View Figure 3 ) coxa rectangular, posterior and ventral margins with feeble setae; basis 1.50 times merus, with four simple setae anterodistally and eight unequal simple setae and one plumose seta posteriorly; merus to propodus setose anterodistally and posteriorly; merus slightly shorter than carpus and propodus combined; propodus 1.11 times carpus, with seven spines and seven setae posteriorly and one penicillate seta ventrodistally; dactylus ( Figure 3D View Figure 3 ) vestigial, subequal in size to adjacent spines.
Pereopod 4 ( Figure 3E View Figure 3 ) similar to pereopod 3 except coxa wider and produced posteroventrally; basis slightly more setose posteriorly.
Pereopod 5 ( Figure 3F View Figure 3 ) coxa large, square, width subequal to length, bilobate, anterior lobe larger, midventral margin slightly concave inside; basis ovate, 1.36 times merus, with long simple setae on both margins and row of plumose setae posteromedially; merus gradually widening, 1.70 times carpus, both margins with long setae; propodus short, 0.66 times carpus; dactylus short, 0.31 times propodus, with one penicillate seta proximally.
Pereopod 6 ( Figure 4A View Figure 4 ) similar to pereopod 5, but stouter and longer; coxa smaller than coxa 5, bilobate, anterior lobe stronger, anterior margin straight, posterior margin convex, ventral margin slightly concave; basis elongate-ovate, anterior margin with six simple setae and 11 plumose setae, anterolateral surface with 16 simple setae, posterior margin with row of simple setae, posteromedial surface with 13 plumose setae; ischium-dactylus similar to pereopod 5.
Pereopod 7 ( Figure 4B View Figure 4 ) long and spinulose; coxa ovate, small, ventral margin with four feeble setae; basis subovate, 0.80 times length, midanterior margin spinose, posterior margin straight, setose, posteroventral lobe round; merus 1.10 times carpus; carpus subequal to propodus, 1.19 times dactylus; dactylus spiniform, with two simple setae apically.
Epimeral plate 1 ( Figure 4C View Figure 4 ) convex posteriorly, ventral margin with 15 simple and four lateroventral setae; epimeral plate 2 posterior margin straight, posteroventral corner subquadrate, with three subventral setae; epimeral plate 3 rounded posteroventrally with seven feeble setae.
Pleopods strong, peduncles shorter than rami; rami long, subequal with long plumose setae.
Uropod 1 ( Figure 4D View Figure 4 ) peduncle 1.42 times outer ramus, distal half with five to seven dorsomedial spines, proximal half with four or five lateral spines and ventrolateral margin with two to four spines; outer ramus slightly shorter than inner ramus, with two dorsal spines; proximal parts of medial margin of outer ramus and lateral margin of inner ramus slightly serrulate.
Uropod 2 ( Figure 4E View Figure 4 ) peduncle subequal in length to outer ramus, with three dorsolateral, one lateroproximal and two or three dorsomedial spines; outer ramus 0.93 times inner, with three or four dorsal spines; inner ramus with two dorsal spines.
Uropod 3 ( Figure 4F View Figure 4 ) 0.69 times uropod 2; peduncle 0.90 times outer ramus, with three dorsal spines; outer ramus 0.86 times inner, both rami with two dorsal spines.
Telson ( Figure 4G View Figure 4 ) subrectangular, 1.28 times width, slightly narrowing and weakly concave distally, dorsal surface with two pairs of penicillate setae, two subdistal and two distal setules.
Male paratype. Body ( Figure 5A View Figure 5 ) 5.4 mm long, more slender than female; head ( Figure 5B View Figure 5 ) galeate, 1.31 times pereonites 1 and 2 combined; rostrum moderately deflexed, not reaching end of peduncular article 1 of antenna 1; lateral cephalic lobe rounded; eye with scattered ommatidia, situated dorsolaterally.
Antenna 1 ( Figure 5C View Figure 5 ) 0.25 times antenna 2; length ratio of peduncular articles 1–3 = 1.00: 0.83: 0.65, peduncular article 3 and flagellum articles 1–4 with numerous aesthetascs; flagellum 10-articulate, longer than peduncle, first article 0.88 times peduncular article 3.
Antenna 2 ( Figure 5D View Figure 5 ) slightly shorter than body length; peduncular articles 1–3 ambiguous, short; article 4 1.42 times article 5; flagellum 55- to 60-articulate.
Right mandible ( Figure 5E View Figure 5 ) similar to females, but distal article of palp elongate and apically rounded, 0.66 times article 2, D3 setae much shorter.
Telson ( Figure 5F View Figure 5 ) subrectangular, 1.39 times width, dorsal surface with two pairs of penicillate setae, distal margin with a pair of setules and tiny penicillate setae.
Remarks
This new species resembles Perioculodes seohae Jo, 1990 from Yellow Sea of Korea in having 1) short dactyli of pereopods 3 and 4; 2) carpal lobes of gnathopods 1 and 2 extending far beyond posterior margin of propodus; and 3) outer plate of maxilliped reaching halfway along palp article 2. However, the new species is obviously distinguished from P. seohae Jo, 1990 by the combination of the following features ( P. seohae characters in parentheses): 1) rostrum is moderately flexed (vs. strongly deflexed); 2) gnathopods 1 and 2 carpi reduced, cryptic (vs. carpi about 0.2 times propodi); 3) gnathopods 1 and 2 with transverse palms (vs. oblique palms); 4) the dactyli of pereopods 3 and 4 are vestigial (vs. 0.25 times propodi); and 5) body length is 4.5–8.0 mm (vs. 2.0–4.0 mm).
Distribution
Shallow waters of Korea (East Sea, Korea Strait).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.